Single-source the package version

[Faerkeren]

Problem

Package version metadata is inconsistent.

pyproject.toml:7 declares version 1.1.2, while src/haclient/__init__.py:68 exposes __version__ = "0.2.0".

Suggested Fix

Use one source of truth.

Options:

• Remove __version__ and tell users to use importlib.metadata.version("haclient").
• Or configure Hatchling to read the version from src/haclient/__init__.py.

Add a packaging test that asserts the imported version matches package metadata.

Rationale

Mismatched versions confuse users, bug reports, and release automation. This is low effort and should not be left wrong.